yes this model has a non threaded barrel and is MA legal

Hi Gerald, yes sir, the non-threaded version is MA legal.
Prohibited:
✘ Massachusetts-defined “Assault Weapons”
✘ Any semi-automatic rifle that has an ability to accept a detachable magazine and has at least two of the following:
● Folding or telescoping stock
● Pistol grip that protrudes conspicuously beneath the action of the weapon
● A bayonet mount
● Flash suppressor or threaded barrel designed to accommodate a flash suppressor
● Grenade launcher.
.
This does not have 2 'evil' features. It has a pistol grip.
It does not have any of the other features which would make it prohibited.
.
budsgunshop.com/feeds/state_reg/massachusetts_restrictions.pdf ,
Stay safe & have a great day!